In the first level of the game (Robinson home), you'll eventually need to find your Uncle Art. He's outside, in the front yard. Once you approach him, he goes into a protectosphere and goes away. Go into the protectosphere generator yourself, and complete the (very linear) course.
Once in the pool, you'll have to zoom onto superior platforms by using boosts.
You don't need to beat the set time. Doing it is not required for any other achievement either.